Features of loparite dissolution in aluminosilicate melts (experimental investigation)

The solubility of loparite (Na, Ce, Ca)2(Ti, Nb)2O6) in aluminosilicate melts of various compositions was experimentally studied at T = 1200 and 1000°C and P = 2 kbar under dry conditions and in the presence of 10 wt. % H2O in a high gas pressure vessel with a duration of 1 day. The initial material was previously melted glasses of malignite, urtite and eutectic albite-nepheline composition, as well as natural loparite of the Lovozero massif. The dependence of the solubility of loparite on the composition of the aluminosilicate melt (Ca/(Na + K), (Na + K)/Al) has been revealed. Partition coefficients of a number of elements (Ti, Nb, Sr, REE) between silicate melt and loparite crystals (Ki = Cimelt/Cilop) were estimated.